N-bromobutanimide → 3-Benzoyloxy-4-chlorobenzyl bromide

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The title compound was prepared by adapting the method for 3-benzoyloxy-4-fluorobenzyl bromide using 3-benzoyloxy-4-chlorotoluene (2.47 g, 10.0 mmol), NBS (1.96 g, 11.0 mmol) and benzoyl peroxide (10 mg) in carbon tetrachloride (25 mL). The residue was purified by flash column chromatography [SiO2, EtOAc/n-hexane (1:40)] to give 3-benzoyloxy-4-chlorobenzyl bromide as a colourless oil (2.012 g, 62%) which solidified on standing and was used without further purification; δH (400 MHz, CDCl3) 4.48 (s, 2H), 7.27 (dd, J=8.2, 2.0, 1H), 7.36 (d, J=2.0, 1H), 7.46 (d, J=8.2, 1H), 7.50-7.58 (m, 2H), 7.64-7.71 (m, 1H), 8.22-8.28 (m, 2H). LRMS (FAB+) m/z (rel. intensity) 325.0 (81, [M+H]+), 327.0 (100, [M+H]+);

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